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Mr. Kemp, currently Toronto's senior vice president and executive creative director, will replace Dennis Ryan, who left the WPP Group agency in December to become the top creative for Omnicom Group's still-unnamed agency for the $400 million PepsiCo and Gatorade business.

report to JWT Chicago President Brian Heffernan and oversee the 60-person creative department. He had been an early candidate for the post but was reluctant to leave Canada, insiders said.

"I know JWT Chicago's clients and have worked on several of their brands," Mr. Kemp said in a statement. He has supervised creative for Philip Morris Cos.' Kraft Foods, Pfizer/Warner-Lambert, Unilever and Nestle, among others.

It is unclear what influence he will have on Philip Morris' Miller Brewing Co.'s Miller Genuine Draft business.

JWT executives were not immediately available for comment.

Mr. Kemp has worked for several agencies including WPP sibling Ogilvy & Mather, Cossette, Bcom3 Group's Leo Burnett and Omnicom Group's TBWA/Chiat/Day after beginning his career in 1983 at Young & Rubicam, Toronto. In 1998, he joined JWT Toronto as executive creative director.